Use of antenna nulling with frequency-hopping against the follower jammer

Eken, F.

doi:10.1109/8.99049

Cited by 30 publications

(9 citation statements)

References 14 publications

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“…Synchronization between the t ransmitter and the receiver is difficu lt to realize. Studies on the slow FH-SS system in the presence of partial band interference were presented in [7,8] and other effects about the reduction of dynamic jammers are described in [9,10,11].…”

Section: Introductionmentioning

confidence: 99%

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Interference Rejection in FH/BFSK System Using Blind Source Separation

Guellil¹,

Benzater²,

Djeddou³

2016

IJITCS

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Abstract-This paper introduces a new approach based on blind source separation (BSS) to mit igate intentional interference in BFSK d igital co mmun ication systems using frequency hopping spread spectrum technique. The use of BSS is possible thanks to adopting an adequate selection block to distinguish between the useful signal and other undesirable signals, hence, circu mvent the problem of amb iguity of permutation. An analytical calculation of the probability of error to predict the performance is done. The simulat ion results showed the effectiveness of this approach, whatever the level of the JSR and without using the fast frequency hopping alternative or error-correcting codes.

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Section: Introductionmentioning

confidence: 99%

“…An antenna array using Sample Matrix Inversion algorith m is used to isolate the desired signal fro m the interference signal [9]. Nevertheless, this algorith m assumes that the antennas have the same gain in the direction of interference and does not work properly for a quasi-static channel fading.…”

Section: Introductionmentioning

confidence: 99%

Interference Rejection in FH/BFSK System Using Blind Source Separation

Guellil¹,

Benzater²,

Djeddou³

2016

IJITCS

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“…In Reference [13] Kohno has combined the antennanulling with the interference cancellation techniques, in order to suppress the co-channel interference in a direct-sequence spread-spectrum multiple-access (SSMA) system. In Reference [14] Eken has combined the antenna-nulling techniques with frequencyhopping for combating the following jammers. In these combination schemes a beamformer is first employed at the front stage creating nulls in the directions of the interfering signals, which have direction-of-arrival (DOA) angles different from that of the desired signals.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of distributed‐antenna communications systems using beam‐hopping

Zhu

Yang

2005

Wireless Communications

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SummaryDigital beamforming (DBF) techniques are capable of improving the performance of communications systems significantly. However, if the transmitted signals are conflicted with strong interference especially in the direction of the transmitted beams, these directional jamming signals will severely degrade the system performance. In order to efficiently mitigate the interference of the directional jammers, in this contribution a beam-hopping (BH) communications scheme is studied. In the BH communications scheme, only one pair of the beams is used for transmission and it hops from one to the next according to an assigned BH pattern. In this contribution, a range of expressions in terms of the average signal to interference plus noise ratio (SINR) performance have been derived, when both the uplink and downlink are considered. The average SINR performance of the BH scheme and that of the conventional single-beam (SB) as well as multiple-beam (MB) assisted beam-processing schemes have been investigated. Our analysis and results show that the BH scheme is capable of efficiently combating the directional jamming, with the aid of utilizing the directional gain of the beams generated by both the transmitter and the receiver. Furthermore, the BH scheme is capable of reducing the intercept probability of the communications. Therefore, the BH scheme is suitable for communications when several distributed antenna arrays are available around a mobile.

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“…Next, Bakhru and Torrieri [2] presented the Maximin algorithm, a speci"c method for adaptive arrays using FH signals, based on the spectral characteristics of these signals. Finally, Eken [4] proposed a modi"ed sidelobe canceller for FH signals that needs a priori knowledge of the direction of arrival of the desired signal. The main limitation of the previous approaches is the fall of SINR at the hop instants.…”

Section: Introductionmentioning

confidence: 99%

Two-stage code reference beamformer for the reception of frequency hopping modulated signals

2000

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This paper presents a beamforming technique for the reception of frequency hopping (FH) modulated signals, which takes advantage of their inherent frequency diversity. This technique, based on a code reference beamformer, requires neither temporal nor spatial a priori reference and allows continuous self-calibration of the array. The proposed framework is composed of two di!erent stages. The "rst stage employs the inverse of the noise plus interference covariance matrix obtained by an anticipative processor. The second stage makes use of the steering vector of the signal of interest which is adaptively obtained by maximizing the output signal to interference plus noise ratio (SINR). Using this information, the "rst stage is in turn readjusted and, as a result, the scheme is able to track non-stationary scenarios following the channel variations with no previous references other than knowledge of the frequency hopping sequence. The two-stage code reference beamformer provides the convergence rate necessary to avoid the SINR reduction associated with frequency hops in existing methods.2000 Elsevier Science B.V. All rights reserved. ZusammenfassungDieser Artikel stellt ein Beamforming-Verfahren zum Empfang von Frequency-Hopping (FH) Signalen vor, welches ihre FrequenzdiversitaK tseigenschaften vorteilhaft ausnutzt. Diese Technik, die auf einem Code-Referenzbeamformer basiert, benoK tigt weder zeitliche noch raK umliche a priori Kenntnisse und erlaubt eine fortlaufende selbst-Kalibration der Sensorgruppe. Das vorgeschlagene Verfahren besteht aus zwei unterschiedlichen Abschnitten. Der erste Schritt verwendet die Inverse der Rausch-plus StoK rsignal Kovarianzmatrix, die im Voraus geschaK tzt wird. Der zweite Schritt benutzt den zum interessierenden Signal gehoK renden Richtungsvektor, der adaptiv durch Maximierung des Ausgangssignal-zu StoK r-plus Rauschsignal-VerhaK ltnisses (SINR) gewonnen wird. Auf Basis dieser Information wird der erste Schritt erneut durchlaufen, wodurch das Verfahren in der Lage ist, nichtstationaK ren Bedingungen zu folgen, indem es sich an KanalaK nderungen anpasst, ohne zuruK ckliegende Referenzen zu benutzen sondern dabei nur die Kenntnis der Frequency Hopping Sequenz ausnutzt. Der Zweischritt-Code-Referenzbeamformer besitzt eine ausreichende Konvergenzrate, um die SINR-Reduktion, die mit existierenden Verfahren verbunden ist, zu vermeiden.2000 Elsevier Science B.V. All rights reserved. Re2 sume2Cet article preH sente une technique de formation de voies pour la reH ception de signaux moduleH s par saut de freH quence, qui tire avantage de leur diversiteH de freH quences inheH rente. Cette technique, baseH e sur un formateur de voies par reH feH rence 0165-1684/00/$ -see front matter 2000 Elsevier Science B.V. All rights reserved. PII: S 0 1 6 5 -1 6 8 4 ( 0 0 ) 0 0 1 4 4 -4 de code, ne neH cessite ni reH feH rence temporelle ni spatiale a priori, et permet une auto-calibration continue du reH seau. Le cadre de travail proposeH est composeH de deux eH tapes di!eH rentes. La premieH r...

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Use of antenna nulling with frequency-hopping against the follower jammer

Cited by 30 publications

References 14 publications

Interference Rejection in FH/BFSK System Using Blind Source Separation

Interference Rejection in FH/BFSK System Using Blind Source Separation

Performance evaluation of distributed‐antenna communications systems using beam‐hopping

Two-stage code reference beamformer for the reception of frequency hopping modulated signals

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